This is a risk question dressed up as a career question. Treating it as a risk question makes it answerable.
First, describe the actual downside
Not the vague fear - the specific one. If the move does not work out:
- How long could you support yourself in the UK without income?
- Could you return to a comparable role in India, and how long would that take?
- What does the gap on your CV cost you?
- Who else is affected - partner, children, parents?
Most people find the honest downside is "a difficult 12 to 18 months and a significant financial hit", not ruin. That is a very different thing to decide against.
Second, price the upside properly
Not the gross salary. The realistic net position after tax, rent and cost of living, plus the non-financial gains: international experience, access to different markets, the option value of a second country. See how much do software engineers earn in the UK vs India for how the headline gap narrows.
Third, check whether it is actually reversible
The strongest argument for going is that the decision is usually reversible. Skills transfer, and returning professionals with international experience are often well received in India - see can I return to India after studying in the UK. Reversible decisions deserve less agonising than irreversible ones.
Fourth, reduce the uncertainty before you commit
The word "uncertain" is doing a lot of work in this question, and you can shrink it:
- Do not resign until a visa is granted. Ever.
- Build a reserve covering six months of UK costs.
- Test the market first - apply, interview, see what happens before you decide.
- If sponsorship is not realistic yet, take the study route, where each stage has published criteria.
The version of this decision that goes wrong
Quitting first, then job hunting. Moving with three weeks of savings. Assuming a course automatically leads to a job. Trusting an agent's promise instead of published rules. Almost every bad outcome traces to one of these.
Next step
If the study route is the lower-variance version for you, explore the Level 3 Diploma in Business and Management or contact admissions to plan it.