My best short term solution? Go for a bike ride/ hike/ brisk walk for 20 minutes. Drink a ton of water, and then try.
Longer term solutions to consider:
Vitamin B3, B6, and B12 CRUCIAL to maintaining healthy veins and arteries. Go get some. Take them.
This may sound obvious but I have to remind myself all the time to DRINK WATER even if it makes me want to barf, just. Do it.
Vitamin K is especially helpful because it's target focus is keeping your capillaries (the wall of your blood vessels) thick, and resilient against breakage.
Spinach, kale, broccoli, chicken, and kiwi are all great sources of Vitamin K, or you could take a supplement.
Something I take regularly to help counter the damaging effects is an amino acid in supplement form called L-arginine. It works in tandem with citrulline which is found in abundance in foods like watermelon, to form nitric oxide (no, no, nitrIK oxide)

in your body.
Nitric Oxide = lower BP, >blood clots, + stronger flexible vein walls
Good luck
I am a past IV user but I am running into a brick wall, most of my blood vessels are tiny, excruciatingly so. My leg veins are almost all gone, my arm veins were almost completely unusable from before because they were way too tiny even nurses blew them all the time, so here is my question; does anyone have any ideas on how I can continue to use? Believe it or not, I don't use that much but even with that I'm just not able to continue on, and I enjoy it very much. Thank you in advance for any suggestions.