How important is it now to set up advertising. To be the main activity. In contact with?

Question

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I want to engage in targeted advertising in Belarus, but only its settings and on the Vkontakte platform. Does it make sense to engage in targeted advertising on VK, or is it better to choose another social network, or another method for promotion. For example, completely go to the context and earn money there. The plans are to make high-quality advertising settings + creatives. After adapting in this segment, the development of the bot and smm. Which platform can you choose to set up ads for free and build your portfolio. For example, it’s easy to analyze the audience, groups and offer sample ads for the test + creatives. Is it possible to assemble a portfolio in this way, based on recommendations.