Samatha meditation continuation problem / lose urge to continue

I know this is not the place for this kind of questions. But I post this anyway. **I am seeking advice on Samatha meditation.** Time to time, I get strong urge to do Samatha meditation.(I'm not an expert on this). So, I start with a combination of Maithree, Anapanasati and Vipassana meditation to cut down five hindrances . At this level, I reach happy state. Then I switch to Kasina meditation. But I can't continue Kasina meditation enough time to reach any static Nimitta . That's because I lose urge to continue / neediness to reach Dhayana. Sometimes, - I feel full - I feel, can't hold any more fullness ( full pressure) - less neediness to continue . So, I feel one or multiple of above and then I can't continue the meditation. Like, I feel like I can't continue anymore. (but I want to). But through all this, I feel happy. (after Maithree and Vipassana meditation) So, questions are , - Why is this happening? - Why I lose urge? - Why sometimes feel full pressure? - How would I overcome this? ___ My own idea of the problem is, - maybe I didn't actually reduce the five hindrances evenly, maybe I reduced the 1,2 and 5, but I think, maybe I didn't reduce 3rd and 4th hindrances. (main point). - maybe my Vipassana is too much(for Samatha) and I lose carving(thanha) for Dhayana. (newly added this line). - maybe I don't have enough capacity. - maybe my methods are wrong. It could be one of above or something else. ___ Five hindrances > order is as in this article. 1. Sensory desire (kāmacchanda) 2. Ill-will (vyāpāda; also spelled byāpāda) 3. Sloth-and-torpor (thīna-middha) 4. Restlessness-and-worry (uddhacca-kukkucca) 5. Doubt (vicikiccha) **Thanks 🙏. ☸️.** **Any help is appreciated.**