with limited budget i can just suggest renew contract and get wifi 6 from tm

alternatively look for mercusys product. it's budget sub brand of tp link

for coverage you need to check whether it comes with dedicated FEM (PA and LNA). you can look up for these if you not too familiar with that

if wifi 6 is not important at all, can check out Mercusys AC1900 MR50G (by tp-link) because 3x3 antenna is better than usual 2x2 budget model yet within your limited budget (on flash sales of course)

nope. tenda AC23 platform is no good enough https://www.acwifi.net/8338.html