First of all, it's perfectly viable to just not eat meat. Tons of people don't eat meat and are perfectly healthy.
If you need meat replacements, (which is for taste, let's be clear) there are a TON of good substitutes, for example Beyond.
Also to your previous point, food waste is a big problem, but thermodynamically, meat IS food waste. Only a fraction of the energy of animal feed is present in the meat, which is super resource intensive and environmentally terrible (not to mention all the methane produced)