Ok, i had the feeling you’re not an “elder”.
I want to give you a warning on this game (that you can accept or not, that’s up to you)
Even big spenders can struggle on getting the ascension items they want, even buying the ascension packs/taking down great titans.
So if you keep collect 5* heroes summoning but you have to wait (even months) to get the ascension items you want, the feeling of stagnation or stalemate can pop up eventually.
Even more, if you have a budget that you don’t want to exceed, you don’t need to rush if the heroes you already have has stop growing.
Take your time to see what’s the best for you and what can be useful to grow.
Most likely you can’t think to upgrade more then one 5* hero per color very soon, so you have to carefully do your choices.