The first thing you need to bare in mind is that Allah is the most forgiving and he is capable of forgiving any sin as long as repentance was a sincere one:
Truly, Allah loves those who turn unto Him in repentance and loves
those who purify themselves. [Quran, 2:222]
Although sincere repentance may cause your sins to be forgiven, it isn't an easy task to attempt to remain stead fast on the righteous path and avoid sins:
Do the people think that they will be left to say, "We believe" and
they will not be tried? [Quran, 29:2]
Life is a struggle and one should remain strong throughout their, one cannot achieve this by their own rather by supplicating to God and relying on him after you have done all that you could possibly do:
And when My servants ask you, [O Muhammad], concerning Me - indeed I
am near. I respond to the invocation of the supplicant when he calls
upon Me. So let them respond to Me [by obedience] and believe in Me
that they may be [rightly] guided [Quran, 2:186]
And He will provide him from (sources) he never could imagine. And
whosoever puts his trust in Allah, then He will suffice him. Verily,
Allah will accomplish his purpose. Indeed Allah has set a measure for
all things [Quran, 65:3]
Performing prayers is one of the most important factors that will help you in avoiding going back to your old sins:
(and perform the Salah. Verily, the Salah prevents from Al-Fahsha' and
Al-Munkar and the remembrance of Allah is greater indeed.) [Quran, :]
Your employer has no right to prevent you from doing this and in many countries (even non-muslim countries) this is considered as discremenation in the work place therefore know your rights and excersise them if not find a new employer and Allah will help you in the process:
Abu Qatadah reported: The Prophet, peace and blessings be upon him,
said, “Verily, you will never leave anything for the sake of Allah
Almighty but that Allah will replace it with something better.”
Source: Musnad Aḥmad 22565
Changing the environment your in and those around you that have a bad influence on you is essential for you to remain a righteous person:
And keep yourself (O Muhammad SAW) patiently with those who call on
their Lord (i.e. your companions who remember their Lord with
glorification, praising in prayers, etc., and other righteous deeds,
etc.) morning and afternoon, seeking His Face, and let not your eyes
overlook them, desiring the pomp and glitter of the life of the world;
and obey not him whose heart We have made heedless of Our Remembrance,
one who follows his own lusts and whose affair (deeds) has been lost. [Quran, 18:28]