This happens to capable people, and it is more recoverable than it feels at the time. Here are the options, roughly in the order worth considering them.
First: check your visa position
Before anything else, know your dates. When does your current permission expire? Have you applied for the Graduate Route, and did you apply from inside the UK before your Student visa expired? Every option below depends on your status, and status problems are far harder to fix retrospectively. Use gov.uk and your university's international student adviser.
Option 1: Widen the search, not just deepen it
Most stalled searches are too narrow. Widen on three axes: geography (outside London), sector (your skills in an adjacent industry), and level (a role slightly below target that gets you UK experience). A first UK job at any level makes the second one substantially easier.
Option 2: Take bridge work while you continue
Part-time or temporary work that keeps you solvent and in the country while you keep applying. Keep it part-time if you can so the search continues - see why do some Indian graduates end up working in retail in the UK.
Option 3: Fix the application, not the effort
If you have sent a hundred applications with no interviews, sending two hundred will not help. The problem is upstream: CV format, targeting non-sponsoring employers, or a mismatch between your profile and the roles. Get your CV reviewed by your university careers service and audit where you are applying.
Option 4: Add a credential or a placement
A further eligible course, a professional qualification, or an internship can extend your runway and close a specific gap - but only do this if you can name the gap it closes. "Another degree" as a delaying tactic is expensive.
Option 5: Return with a plan
Going back to India with a UK degree and applying to UK-facing employers is a legitimate outcome, not a failure - and it keeps a future UK move open with better experience behind you. See can I return to India after studying in the UK.
What not to do
Do not overstay. Do not work outside your visa conditions. Do not pay an agent promising a job and a visa. All three turn a difficult period into a lasting problem.
Next step
Contact LSBUK to talk about qualifications that address a specific gap, or explore our programmes.