Caffeine is a plaster or band aid for an unhealthy diet and lifestyle and/or insufficient sleep. So the first week after quitting caffeine you will feel wrecked but it gets better after that. However you may not reach the 'highs' of your caffeine days owing to the above. If you change your diet, reduce stress and work on your health - a long term project - it can help with that. e.g. if you started meditating, did qi gong, cut out processed foods and refined sugar etc. Keep up with stretching and so on. Take adaptogenic herbs, like coryceps, red ginseng, etc. Some of these you can have as a tea. My health is trash but its a work in progres. However I don't drink caffeine except on special occasions, like if I have to drive really far on the motorway or someone offers me some tea. Otherwise none at all. If you drink it every day you just end up relying on it and getting used to it, rather than it actually giving you a boost. I don't drink booze anymore. I enjoy red wine, but it makes you fat, can cause ankle or leg swelling, my liver is probably fatty enough as it is without adding alcohol, it dehydrates your body, it is a neurotoxin etc. So I never drink.
Cold turkey or reduce your intake over time, whichever works best for you.
Also if you do drink caffeine, then drink something healthier, like yerba mate (its fucking strong so go easy on it lol) or white tea which are both high in antioxidants. Coffee and black tea are a mixed bag.