I have noticed that I kind start mixing strawberry recipes in small quantities like 15ml so I can keep making them fresh
Your problem is not over flavoring but ethyl malthol. It mutes very quickly and some of the flavors out of the recipes listed above contain either EM or fructose and sucralose, adding further too the problem. Hence why some popular strawberry recipes are always listed as shake and vape, getting milder within 8-14 days and loose their flavor fully around 3 weeks. Faster if you put more in it lol.
Going by that recipe, strawberry ripe contains EM by itself and not in small amounts
Cap sweet strawberry does contain some kind of sweetener as well
Too top that off you adding all 3 sweeteners that by itself do not only mute, but canceling themselves out, might wanna add the 4th? Stevia? Lol
Joke aside, use one sweetener if you have too, use it at low percentage and work up.
Try adding enhancing or supporting flavor profiles as well as body/mouth feel to your strawberries. Not only will it taste better but also lasts longer. Obviously if you can't taste strawberry like many people, nothing going too change that.
Edit: I'm pretty sure sugar cookie contains and while it might be small amount of AP, also muting if used too much, and in general with your recipe I'm surprised you get any flavor after 48 hrs