Let's create a campaign. In the goal selection window, put Leads - this is optimization for collecting contacts and transitions to messengers.
At the adset level, in the Conversion location, select Website instead of Instant Forms. This is necessary so that traffic goes to your landing page or layout with a transition button to Telegram, and does not remain inside Meta.
Performance goal set Maximize number of conversions - the algorithm will look for people who click and subscribe more often. In the Dataset we indicate our pixel, and in the Conversion event we indicate an event from the site (for example, a click on a button in Telegram).
Next, choose placements, age, gender, devices for your niche. The main thing is that the link in the ad leads to a landing page with an installed pixel, where the user gets to your Telegram channel or bot in 1-2 clicks. Upload your creative and get started. Good luck