I was once using my ETX90 a year or two ago and heard a faint "pop" like sound and could feel it through the focuser knob. Immediately I noticed the out of focus image looked off, no longer circular. It looked very much like your pic. I focused in and out all the way to see if it would reverse itself but it stayed that way. I took the back off and there are 3 push and 3 pull screws to collimate the mirror. I was able to get it back to normal within about 20 min by adjusting those a bit. It's been collimated dead on for over a year now. I do not know much about your particular mak, but I'm willing to bet if you can get to the collimation screws than you can tweak it back.
I thought I would describe the collimation process I went through. I set the scope up on the mount inside and pointed it down the hall at a "fake star" I made (a flashlight with tin foil over it with a tiny pin point hole poked in it). Getting to the collimation screws involved taking the whole back off but it was quite easy on my ETX, only being like 2 or 3 screws. Taking the back off also took off the visual back so I ended up taping a cheap eyepiece directly over the hole so I could assess collimation as I worked. From there it was just a matter of very slightly adjusting the screws in order to make your out of focus pattern look like a nice perfect doughnut. Then I would move it out of focus the other way and tweak on it a bit that way to make everything nice and round. Repeat until it was perfect on both sides of focus. Some advice though, loosen the push or pull screw before you tighten the opposite one so you don't pinch the optics. Also, start by slightly loosening them all just barely to relieve any tension that might be pinching the optics... that alone could be the problem.
Edit: Now that I read the post above I realize your pic is of Venus. Venus has phases like the moon so it's actually hard to know for sure what your star pattern looks like when pointing at it. If a bright star looks like that as well then it's a collimation issue.
Edited by cst4, 19 February 2020 - 02:52 PM.