Senior is just a title. Don't sweat/too obsess over it.
"Real" senior is the role model for his work quality, leadership and his ability to be counted on when issues arise.
Just do your best or beyond your normal job scope and when people started to acknowledge you for your contribution, that indicates that you've progressed to be a 'senior'.

Exactly, i wouldn't mind if my title without junior. As long as what i deliver are > than that.

I can tell from my experience, my title was "manager" in previous company, current company title is senior associate (supposedly a downgrade in terms of title), but current pay is 28% more, and I absolutely love more my current working situation than previous one.

Personally I dont mind the title, as long as my salary continues to go up. Cause at some point, you will start questioning everything cause your job scope is too much but your pay is just so so (compared to your title). Even worse when you are managing vendors who are paid so much more than you but their title is way below yours.

But at the end of the day, you do you. If you want to become senior at your current company, talk to your boss/superior on what you can do in order for him/her to give you that title (or recommend to HR).

can try to talk to your superior what're the factors causing you to stuck?

Cant really advise as there seems to be very little context given.
but promotion depends on a lot of things, depends on yourself, depends on the leaders in the company, depends on the company, depends on opportunity.

Yourself
One of the earlier advice I got from my previous management is that "you need to behave like one before you become one". I strongly believe you don't need a title to lead/mentor others. Many think that they will do it after they are promoted. But if you are not doing it now, or showing some sign of it, how should one know you are capable or suitable? If you always voice out constructively in a meeting, guide people without being asked to, always try to improve process, etc, I guarantee that your supervisor and your team mates will take notice. Its not about being in a job for period of time, or being good at what was handed to you.

Company
If the company's structure is flat, and there is very little managerial position, or there is not classification of seniority of a position, obviously its harder to get a promotion

Opportunity
Opportunity doesn't come often, but when it does, you need to be ready. Referring back to point one, you need to show that you are ready, that if a senior position is open, they should consider internally and more importantly, consider you.

Although I must say, many opt to leave a company and join another to gain promotion. Talking to your manager helps too, 1st you signal that you have drive. 2nd, you understand what she/he wants from a senior, 3rd, you would hopefully be given the opportunity to take on more responsibility.

by the way, what is your age?

Seems like a lot of things one need to discover..

I’m reaching 30 soon