What are the affordable anti-aging treatments?

Hello, I am a beginner who visits a dermatologist regularly but has never received any anti-aging treatments. I suffered from severe acne last year and have been living with sensitive skin ever since; my skin has aged really suddenly since that point. I suspect it might be because I can no longer use the firming or nourishing products I used to use.

Anyway, I’d like to start with some anti-aging treatments, but what are some cost-effective options? The anti-aging treatments I know of are lifting procedures like Ultherapy and Thermage, but I feel like the cost is a bit of a burden to start lightly.

For those of you receiving anti-aging treatments, what procedures did you usually start with? Please recommend some procedures that are easy to start with, without worrying about cost or side effects!