Don't forget, that they all offer more than just email and that they all have different plans. Which is good.

Well just do it again if you liked it. It comes with doing it often. Sometimes boulder places have classes to level up one level and teach some technique. Build some strength but it comes with doing it more often.

Best practices: keep the arms long, pull out of your back and not your biceps. Get good fitting shoes. Stand on the tip of your foot and not with your whole foot on the boulder.

Don't overdo it, take it slowly and enjoy your time :)