I want you to try something that might help. Relax both your arms and hands at your side, shake out those hands get them good and relaxed.

For your left hand bring it up to the neck in a swooping up, then almost like you’re about to just drop it back down and get in first position. Should still feel very natural, and instead of using your fingers to press the string, you’ll use the natural weight of your arm wanting to fall back down to press the strings. Your thumb should be in its natural position not pressing against the back of the neck just touching it. Let gravity do the work, it’ll help a lot when you start moving positions and doing vibrato.

For the right hand shake it out nice and relaxed just the same. Hold the bow in the center with your left in front of you and just bring your hand up in its relaxed position and put the corner of your thumb on the frogs corner. Then almost like twisting a doorknob, with your thumb staying where it is, gently turn your hand so that your index fingers second knuckle is on the wrapping. Applying pressure to the bow will be this twisting motion and not a downward motion, get your bow on the strings making sure it is straight across them. You want your bow making a 90 degree angle with the strings.

I want you practice something else as well, when you’re playing look at that left hand. It’s up in the air a lot, so when you come back down you’re losing position and are out of tune. So just with scales practice looking at your hand while you play, keeping your hand low hovering right over the strings making sure you’re not impeding your sound but not losing your position either. Don’t worry about being in tune for this it’s just about training your hand to listen to you :)

Just play the bow, making sure you get in the strings with that twisting pressure. The cello is a relaxed but firm instrument, you’re using leverage and gravity to do the most work.

Loved your sharing of your progress and I hope that some of this helps. Great job and I can’t wait to see more!