I don't think you can tweak further because I tweaked mine as well to be super frugal. I'm still on Digi RM38 like your grandpa. What you can do is downgrade your Digi RM58 to the new RM40 5G SE. The Unifi+UnifiTV is probably the cheapest combo already. Other option like any 100Mbps + Sooka will end up slightly more than your RM130. I'm on Maxis RM89+RM10 for land line, Astro RM43.15 for the oldies. For me, just get a cheap but reliable phone like Samsung (A05s, A15, A25, etc) due to their 2 Android + 4 years security update. Most phones fuck up because there's no proper software update and not so much on hardware issue. Those phone plan usually require you to sign up for package higher than your RM58 right now. The RM40 Digi 5G SE is already more than enough of data.