Yeah, mindfulness isn't a catch-all, just another tool to help with mental health; daily exercise / walking is a big help, as are some supplements I've found (check out reviews for Ashwagandha (herbal adaptogen), Gabapentin (amino acid), and tryptophan (amino acid), calm magnesium powder (or other magnesium supplements); I take the last three of I'm having trouble sleeping and it wipes me out completely (I a good way).

Daily exercise/ walking was huge for me during my most anxious times, especially paired with mindfulness.

Another helpful tool is writing down everything you're anxious / stressed about and setting aside time to try to find solutions for those particular stressors. Writing it all down and giving yourself a future date / time to think about it helps unload some of the pressure so you can go about your day to day without so much weighing you down. And even if you can't find solutions to those issues immediately at least you're giving focused time to them and only within a specific window.

Part of mindfulness is that over time it relaxes your central nervous system and helps build resilience to stress. The more you can put time in the quicker you can get to that place (I did read this from a scientific study but unfortunately don't have the source off hand)